title: [Computer-assisted control of CT-guided caudo-cranial puncture access route using the triangulation method].
abstract: OBJECTIVE
  To control the position of a puncture needle on an access route, which is not parallel to the CT-scan, using control scans not showing start and target points.
  
  
  METHODS
  A software tool has been developed. After CT for biopsy planning x/y coordinates and table position of start and target points have to be determined on CT-scans. The software calculates x/y coordinates of the access route for every table position, which must be marked interactively on control scans. The accuracy of the programme was proven experimentally and the method was used in five patients.
  
  
  RESULTS
  There was no difference between the calculated and measured access route in the experiment. Four of five patients were punctured successfully using our method.
  
  
  CONCLUSIONS
  Our method is a promising procedure to control a CT-guided caudo-cranial biopsy access route.
authors.affiliation: Institut und Poliklinik für Radiologische Diagnostik, Universität zu Köln.
authors.forename: H J
authors.initials: HJ
authors.lastname: Langen
authors.forename: T
authors.initials: T
authors.lastname: Krahe
authors.forename: A
authors.initials: A
authors.lastname: Gossmann
authors.forename: W
authors.initials: W
authors.lastname: Schneider
mesh_terms: D001707:Biopsy, Needle / Q000379:methods*; D006801:Humans; D008099:Liver / Q000473:pathology; D008101:Liver Abscess, Amebic / Q000175:diagnosis / Q000473:pathology; D008113:Liver Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000556:secondary; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D011187:Posture; D012984:Software; D013369:Subphrenic Abscess / Q000175:diagnosis / Q000473:pathology; D018243:Teratocarcinoma / Q000175:diagnosis / Q000473:pathology / Q000556:secondary; D014057:Tomography, X-Ray Computed / Q000379:methods*
vernacular_title: Computergestützte Kontrolle eines kaudo-kranialen Punktionsweges im CT bei Anwendung der Triangulationsmethode.